Optical tube for cystoscopes, gastroscopes, and the like



April 24, 1928.

G. LOECK OPTICAL TUBE FOR CYSTOSCOPES, GASTROSCOPES, AND THE LIKE Filed March 1'7. 1927 iiiilm e Fatented Apr, 24, 1928.

umrsu STATES PATENT OFFICE.

V eun'rnnn noncx, or BERLIN, GERMANY, assIeNon r THE rum: onono WOLF e. m. B, 11., or BERLIN, GERMANY.

OPTICAL TUBE FOB WS'IOSCOPES, GASTROSCOPES, AND THE LIKE. Application filed March 17, 1927, Serial No. 1 76 ,250, and in Germany 011 20, 1828.

The optical tubes for cystoscopes, gas- -ity of lenses 1), b b. All lenses are tro'scopes and the like, unless they are to be fixed separately b means of tubes'inserted too imperfect, contain achromatically cor- Into the inner tu e. Four of these lenses, 4!, rected lens systems consistin of several VIZ, b b 6 and b are united in two cora members, which latter, as is we 1 known, are responding systems with a view to eliminatusually cemented with each other. The oping the chromatic aberrations in the opticaltical tubes of such instruments hitherto used' system. The single members of these syshave the drawback that they have to be terms are also separated from each other by I sterilized" in a comparatively complicated an air space, Y 1e manner, viz, by wiping them ofi, immersing The optical parts of the outer tube con- I them into a disinfecting solution and the slst of a glow lamp 0, a light exit-window like, whereby great care 'mustbe taken in d and 1 a light entrance-window 0 Both order to attain the desired effect. Although windows are provided with closing glasses on the usual construction of the tubes referred Which are fixed in the tube by means of 1a to has been repeatedly modified in order ,to tooth cement.

be able to sterilize the tubes in a simpler and I claim:

better way, viz, by boiling them, the effect 1. Optical tube for cystoscopes, astrostrived for has hitherto, notyet been atscopes andthe like, containing optica parts tained, so that the aforesaid more compliadapted to present to the observer an image so cated wa of sterilizing is still adhered'to. of the part of the body to be examined,

Accor ing to the invention the boiling which'optical parts comprise ,lens systems I may yet be achieved by avoiding any cement composed of a plurality of lenses, the single to e used in the lens systems serving for members of these systems consisting of dif- 05 v eliminating the chromatic aberration, and -ferent kinds of glass in order to achieve 25 constructing these systems as uncemented chromatic correction and not being cemented ones. For cementing the glass parts into \Wlth each other, and means ada ted to sethe metal tube receiving the optical parts, Cure he optical parts in the tu in their as, e. g. the closin glass for the light enposition. 1 trance-aperture in t e outer tube or the light Optical tube for cystoscopes, astro- 30 entrance-prism on uitably uses a t,' scopes and thelike, containing optica parts which is not liable to be attacked by hot adapted to present to the observer an image water, e. g. the so-called tooth cement, he part of the body to be examined, cement as used in dental surgery, I which optical parts partly COI-lSiSt Of lens The anne d dr i g shows as an systems composed of a plurality of lenses, 35 ample two tubes according to the-present inthe gl members of these sys s 110 beventlon. Fig. 1 shows theoptical inner tube g cemented with a other, some of these a cystoscope and Fi 2 h t i i g optical parts being, fixed in the tube by outer tube." Both tubes are represented in mes/11S 0 cement, which is not liable to be? l it di l ti 111g attacked by hot water, and means adapt- 40 The inner tube contains a ridge prism a, ed seculje the other Optical Parts in the ovided with a spherically ground part and tube m then position v l ed with tooth cement, as well as a plural- 2 GUNTHER LOECK- 

